This removes nearly all ToLowerAscii() calls.

Conflicts:
	linguistic/source/convdic.cxx
	linguistic/source/convdiclist.cxx
	linguistic/source/dlistimp.cxx
	sc/source/filter/html/htmlexp.cxx

Change-Id: Iddcaacfb7383e1df3d2f13751a3c788eba953fdd
Reviewed-on: https://gerrit.libreoffice.org/5895Tested-by: Caolán McNamara <caolanm@redhat.com>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>